package com.kuang.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.kuang.common.exception.NoStockException;
import com.kuang.common.to.SkuHasStockVo;
import com.kuang.common.to.mq.OrderTo;
import com.kuang.common.to.mq.StockDetailTo;
import com.kuang.common.to.mq.StockLockedTo;
import com.kuang.common.utils.PageUtils;
import com.kuang.common.utils.Query;
import com.kuang.common.utils.R;
import com.kuang.gulimall.ware.dao.WareSkuDao;
import com.kuang.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.kuang.gulimall.ware.entity.WareOrderTaskEntity;
import com.kuang.gulimall.ware.entity.WareSkuEntity;
import com.kuang.gulimall.ware.feign.OrderFeignService;
import com.kuang.gulimall.ware.feign.ProductFeign;
import com.kuang.gulimall.ware.service.WareOrderTaskDetailService;
import com.kuang.gulimall.ware.service.WareOrderTaskService;
import com.kuang.gulimall.ware.service.WareSkuService;
import com.kuang.gulimall.ware.vo.OrderEntityVo;
import com.kuang.gulimall.ware.vo.OrderItemVo;
import com.kuang.gulimall.ware.vo.WareSkuLockVo;
import lombok.Data;
import org.apache.commons.lang.StringUtils;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeign productFeign;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareOrderTaskService wareOrderTaskService;

    @Autowired
    WareOrderTaskDetailService wareOrderTaskDetailService;

    @Autowired
    OrderFeignService orderFeignService;



    private void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId){
        //库存解锁
        wareSkuDao.unlockStock(skuId,wareId,num);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);
        wareOrderTaskDetailService.updateById(entity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {

        //还得拼接上模糊查询

        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();


//        skuId:
//        wareId:
        String skuId = (String) params.get("skuId");
        if (StringUtils.isNotEmpty(skuId)){
            wrapper.eq("sku_id",skuId);
        }
        String wareId = (String) params.get("wareId");
        if (StringUtils.isNotEmpty(wareId)){
            wrapper.eq("ware_id",wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //判断如果没有库存记录就是更新
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.size()==0){
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //远程查询sku的名字,1，这里远程调用肯定存在不稳定的问题，这里如果出现问题，不要回滚，通过catch继续。2，
            try{
                R info = productFeign.info(skuId);
                Map<String,Object> data = (Map<String,Object>) info.get("skuInfo");
                if (info.getCode()==0){
                    skuEntity.setSkuName((String) data.get("skuName"));
                }

            }catch (Exception e){

            }
            wareSkuDao.insert(skuEntity);
        }else {
            wareSkuDao.addStock(skuId,wareId,skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {

        List<SkuHasStockVo> collect = skuIds.stream().map(sku -> {
            SkuHasStockVo vo = new SkuHasStockVo();

            //查询当前sku的总库存量
            //SELECT SUM(stock-stock_locked) FROM 'wms_ware_sku' WHERE sku_id = 1
            Long count = baseMapper.countNum(sku);
            vo.setSkuId(sku);
            vo.setHasStock(count==null?false:count>0);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**为某个订单锁定库存
     *默认只要是运行时异常都会回滚
     * 1，下订单成功，订单过期没有支付被系统自动取消、被用户手动取消，都要解锁库存
     * 2，下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚，之前锁定的库存就要解锁。
     * @param vo
     * @return
     */
    @Transactional(rollbackFor =  NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {

        /**保存库存工作单的详情，追溯仓库。
         *
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        wareOrderTaskService.save(taskEntity);

        //1，按照下单的收货地址，找到一个就近仓库，锁定库存
        //1，找到每个商品在哪个仓库都有库存。
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            Integer count = item.getCount();
            stock.setNum(count);
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.ListWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        Boolean allLock = true;
        //2，锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            Integer num = hasStock.getNum();
            if (wareIds == null || wareIds.size() == 0){
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            //1，如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发送给mq
            //2，锁定失败，前面保存的工作单信息就回滚了，发送出去的消息，即使要解锁记录，由于去数据库查不到id，所以就不用解锁
            //
            for (Long wareId : wareIds) {
                //成功就返回1，否则返回0
                Long count = wareSkuDao.lockSkuStock(skuId,num,wareId);
                if (count==1){
                    //锁定成功
                    skuStocked = true;
                    //TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity taskDetailEntity = new WareOrderTaskDetailEntity(null, skuId, null, hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    wareOrderTaskDetailService.save(taskDetailEntity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(taskDetailEntity,stockDetailTo);
                    //只发id不行，防止事务回滚后找不到信息了。
                    lockedTo.setStockDetail(stockDetailTo);
                    //发送数据
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    break;
                }else {
                    //锁定失败，重试下一个仓库
                }
            }
            if (skuStocked == false){
                //当前商品的所有仓库都没锁住
                throw new NoStockException(skuId);
            }
        }

        //3、肯定是全部都锁成功的
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        System.out.println("收到解锁库存的消息");
        Long id = to.getId();
        StockDetailTo detail = to.getStockDetail();
        Long skuId = detail.getSkuId();
        //解锁
        //1，查询数据库关于这个订单的锁定库存信息。
        //有：库存锁定成功，但是要不要解锁还得判断别的。
        //     1，没有这个订单，必须解锁。
        //     2，有这个订单，不是解锁库存，判断订单状态   已取消：解锁库存。 没取消：不能解锁。
        //没有：库存锁定失败，库存回滚了。这种无需解锁。
        WareOrderTaskDetailEntity byId = wareOrderTaskDetailService.getById(id);
        if (byId!=null){
            //解锁
            Long id1 = to.getId();
            WareOrderTaskEntity taskEntity = wareOrderTaskService.getById(id1);
            String orderSn = taskEntity.getOrderSn();
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0){
                //订单数据返回成功
                OrderEntityVo data = (OrderEntityVo) r.getmyData("data", new TypeReference<OrderEntityVo>() {});
                //data==null是订单不存在，出现这种情况的原因是别的服务调用崩了，在锁定之后调用别的业务回滚了。
                if (data == null || data.getStatus() == 4){
                    //订单已经被取消了，才能解锁库存。
                    if (byId.getLockStatus() == 1){
                        //锁定但是未锁定，才能解锁。
                        unLockStock(skuId,byId.getWareId(),byId.getSkuNum(),detail.getId());
                    }
                }
            }else {
                //消息拒绝以后，重新放到队列让别人继续消费
                throw new RuntimeException("远程服务失败");
            }
        }else{
            //无需解锁
        }
    }

    //防止订单服务卡顿，导致订单状态消息一直改不了，库存信息优先到期。查订单状态新建状态，什么都不做就走了。
    //导致卡顿的订单，永远不能解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新库存的状态，防止重复解锁库存
        WareOrderTaskEntity task = wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        //按照工作单找到所有  没有解锁的库存，进行解锁，更新为1之后，就算时间延迟，后面
        List<WareOrderTaskDetailEntity> entities = wareOrderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>().eq("task_id", id).eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }

    }

    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}